AD9547BCPZ

Overview

The AD9547BCPZ is a dual/quad input network clock generator and synchronizer in a 64-lead LFCSP package. It supports Stratum 2 stability in holdover mode and provides reference switchover with phase build-out or hitless switching. The device accepts input reference frequencies from 1 kHz to 750 MHz and generates output frequencies up to 725 MHz. It features a digital PLL with programmable loop bandwidths from 0.001 Hz to 100 kHz, an optional low-noise LC-VCO system clock multiplier, and on-chip EEPROM for power-up profiles. Supply voltages range from 1.71 V to 3.465 V, operating within -40°C to +85°C.

Feature Summary

• Supports Stratum 2 stability in holdover mode with automatic/manual holdover and reference switchover capabilities.
• Features two pairs of reference inputs configurable as differential or single-ended, supporting frequencies from 1 kHz to 750 MHz.
• Generates output clocks up to 725 MHz via LVPECL, LVDS, or CMOS outputs with zero-delay timing skew relative to the active reference.
• Includes a digital PLL with programmable loop filter (0.001 Hz to 100 kHz), optional LC-VCO multiplier, and on-chip EEPROM for multiple power-up profiles.

Applications

• Network synchronization
• Cleanup of reference clock jitter
• SONET/SDH clocks up to OC-192, including FEC
• Stratum 2 holdover, jitter cleanup, and phase transient control
• Wireless base stations and cable infrastructure

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current data sheet to confirm package type and temperature grade. Confirm serial interface requirements (SPI vs. I2C) and supply voltage compatibility during procurement. Check for any product change notifications that may affect pinout or electrical specifications before finalizing orders.

Selection Notes

Select the AD9547BCPZ when Stratum 2 holdover performance and hitless reference switchover are required. Ensure the application utilizes input references between 1 kHz and 750 MHz and requires output frequencies up to 725 MHz. Consider the optional LC-VCO if lower phase noise is needed for the system clock. Verify that the 64-lead LFCSP package fits the PCB layout constraints.

Part Context

The AD9547 belongs to Analog Devices' network clock generator family, designed for synchronous optical networks like SONET/SDH. It integrates a digital phase-locked loop and direct digital synthesizer to clean and distribute clock signals. The BC suffix typically denotes a specific temperature grade and package variant within the AD9547 series, housed in a 64-LFCSP-VQ package.

Replacement Considerations

Check the manufacturer's ordering guide for updated part numbers or alternative packages within the AD9547 series. Verify compatibility with existing board layouts and software configurations if substituting with other variants in the same family.

FAQ

What is the maximum output frequency supported by the AD9547BCPZ?

The AD9547BCPZ supports output frequencies up to 725 MHz for LVPECL and LVDS modes.

Can the AD9547BCPZ perform hitless reference switchover?

Yes, the device supports hitless reference switchover, with a maximum time/time slope of 65,535 ns/sec, satisfying Telcordia GR-1244-CORE requirements.

What is the operating temperature range for this component?

The AD9547BCPZ operates over an industrial temperature range of -40°C to +85°C.

Does the AD9547BCPZ support both SPI and I2C interfaces?

Yes, the device supports both SPI and I2C serial port interfaces for configuration and control.